Simple activities help explain what makes things wear away, how friction makes things hot, how it helps things to slip and slide or keeps them from doing it, how people use things which turn and spin to lessen friction, and how to make static electricity by friction Topics: Fricton, Friction
Explains the various facets of skyscraper construction, covering foundations, steel, vertical accuracy, derricks and cranes, concrete, curtain walls, elevators, air conditioning, and electricity and telephones Topics: Building, Skyscrapers, Building, Skyscrapers
byHalsey, William Frederick, 1882-1959; Bryan, J. (Joseph), 1904-
"Foreword It would require an extra chapter for me to list all the men who have helped me prepare this book. Certain of them, however, have been outstandingly prodigal of their efforts to make it complete and accurate. They have reminded me of important events I had forgotten and have sharpened my account of events dimly remembered; they have supplied names and dates, dispatches and other documents; they have saved me from countless sins of omission and commission; and if, here and there,... Topics: WWII, World War, 1939-1945, United States. Navy, World War, 1939-1945 -- Naval Operations,...